A simple root would solve your questions but I will answer what I have noticed thus far:

-improved smoothness in the overall ui
-lag free scrolling in the browser
-lag free keyboard
-marginally improved signal
-marginally improved battery life (still calibrate it properly)
-reboots fixed
-zerolag camera has been removed in a way, you must let it focus first. This was a foolproof way to negate the blurry pictures people were taking without touching the screen to focus.

I can't think of anything else at the moment, but I will answer any questions. Just root and save yourself the headache of a botched nexus OTA plan. Google's biggest mistake was letting Verizon take the reigns here. If yu got the phone for first in line updates you'll be disappointed. At this rate the damn razr will get 4.0.3 before we do. Honestly, I think that's why we haven't gotten it yet.